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If it's a 3AJ all I can tell you is that I bought a 1990 (twin headlight)with 50,000 on the clock and did a top end rebuild ( cam followers,piston&rings,camchain,valvesprings and other odds'n'sods)cos they need it at around that mileage.Since I got it(18 months ago)I've used a good quality oil and ZX1 Extralube,it's now got 85000 on it and everything is fine,only had to adjust the tappets one too!.
The only problem I have had(twice)is the nut on the gearbox sprocket comes off,so locktite it on.
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